东昆仑断裂带东段塔藏断裂几何结构及滑动递减模型讨论

Abstract

Abstract: The Tazang fault is located in the eastern part of the East Kunlun fault zone with a length of 170 km, which constitutes the northeast border of Bayan Har block with Minshan fault zone. Satellite image and geological survey have revealed evidence for Holocene movement along the fault. The fault can be divided into three sections by the segmental signs of strike-slip fault, such as geometric and tectonic discontinuities in combination of geomorphic features and fault zone materials. The Locha section generally strikes NWW, developed sinistral left-step with Maqu fault in the west, and rotates clockwise on the Xiahuangzhai village in the east. The Dongbei village section generally strikes NW, and rotates anticlockwise on the entrance of Jiuzhaijou in the east. We divided the Dongbei village section into two sub-sections, and the northern and southern sub-sections are separated by the Minjiang fault. The Majiamo section is divided into three sub-sections, namely Zharu, Tangzhai, Wujiao sections. The elapsed time in Loucha and Majiamo sections was relatively short. The linear horizontal slip of the east Kunlun fault zone transforms into the vertical movement of the Minjiang fault zone and Huya fault zone which trends nearly SN~NNE, and the uplift of Minshan. The fault sections splay out from NW to SE that has good correlation with the slip gradients along the east Kunlun fault.

Key words: East Kunlun fault zone, Tazang fault, Geometry, Segmentation, Tibetan Plateau

CLC Number:

P315.7

LI Jian-jun, CAI Yao-yao, ZHANG Jun-long. Geometric Structure and Slip Gradient Model of the Tazang Fault in the East Kunlun Fault Zone[J]. EARTHQUAKE, 2019, 39(1): 20-28.

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Geometric Structure and Slip Gradient Model of the Tazang Fault in the East Kunlun Fault Zone

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